<d-button (click)="openToast()">click me show simplest toast!</d-button>
<d-button *ngIf="!this.isShow" (click)="openToast2()" bsStyle="common">click me show customer toast!</d-button>
<d-button *ngIf="this.isShow" (click)="closeToast2()">click me close customer toast!</d-button>
<d-button *ngIf="this.isShow" (click)="closeToast3()" bsStyle="common">only close first customer toast!</d-button>
